jsDOM API - The jsDOM project was created in order to develop a Javascript library for creating dynamic html components in browsers that support the DOM. [Open source, LGPL] - http://sourceforge.net/projects/jsdomapi
T-Menu - DXHTML W3C Compliant Menu system - http://www.cfoster.net/tmenu/
XPDOM - A W3C-DOM Level 2 compatibility layer to programming Dynamic HTML in standard DOM and exactly same way in any browser with DHTML capabilities: Navigator 4.x, MSIE 4.x, 5.x and Mozilla/Netscape 6 as reference implementation. - http://xpdom.sourceforge.net/html/index_frame.html
JavaScript and DOM Factory - Visual browser checking for properties of JavaScript and DOM objects. - http://zvon.org/xxl/JSDOMFactory/